<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <style>
        .wrap{
            width: 600px;
            height: 400px;
            border: 1px solid #000;
            display: flex;
        }
        .wrap .inner{
            width: 200px;
            height: 400px;
        }
    </style>
</head>
<body>
    
    <div class="wrap">
        <div class="inner">1</div>
        <div class="inner">2</div>
        <div class="inner">3</div>
        <div class="inner">4</div>

        <div class="btn">
            more
        </div>
    </div>
</body>
</html>